CN2033555U - Accumulator overdischarge memory and equalizing charge unit - Google Patents

Abstract

The utility model relates to an overdischarge memory and equalizing charge unit whose accumulator battery is charged via an alternating-current main line from a current regulator. An operational amplifier with positive feedback is used as the amplifier for delayed comparison. The opposite phase input end is connected with a sampling voltage of the accumulator battery, and the same phase input end is connected with a reference voltage. When a commercial power is interrupted, the amplifier can automatically memorize the overdischarging state after the overdischarge of the accumulator battery. When the commercial power is recovered, the amplifier can control the current regulator automatically, and can provide equalizing charge for the accumulator battery by a voltage which is higher then a setting float charging voltage. Once the expected value is obtained, the equalizing charge can be prolonged for a fixed time through a timer, and then the equalizing charge can turn to a floating charge.

Description

Battery overdischarge memory and balanced charging device

The utility model relates to a kind of electric energy converting equipment to batteries charging or control, and a kind of more precisely to be used for by rectifier be the device of battery charging from ac mains.

In systems such as satellite communication system, telegram retransmission system, data transmission system, program-controlled electronic switching system, microwave relay, do not interrupt for guaranteeing power supply, generally adopt the floating charge power supply mode, promptly rectifier is in parallel with batteries powers to power consumption equipment.Rectifier has the automatic voltage regulation performance, in to the power consumption equipment power supply, returns the batteries boost charge.When the civil power interruption took place, storage battery will be separately to power consumption equipment power supply, i.e. battery discharging.Behind the city power recovery, rectifier again to the batteries equalizing charge, changes boost charge with the voltage stabilizing current-limiting mode over to then.If civil power is longer break period, when the batteries terminal voltage is discharged to certain particular value and promptly overdischarge takes place, in equalizing charge, rectifier should provide than the high voltage of the float charge voltage of having adjusted battery charging, to predetermined value, also want the proper extension equalizing charge time, with the control that guarantees battery uniform charging all in the battery pack, above-mentioned battery pack floating charge mode, overdischarge memory, equalizing charge and delay balance charging, can switch by the personal monitoring, also can particularly microprocessor and software be realized by computer.

The purpose of this utility model is that employing is simple and easy, hardware circuit is realized overdischarge memory, floating charge and the automatic equalization charging conversion to batteries cheaply, and equalizing charge during additional fixed response time, realize unattended operation, combine, constitute power-supply device with rectifier, batteries.

Accompanying drawing 1 batteries overdischarge memory, automatic equalization charging circuit and the enforcement in power-supply device thereof connect.

Hysteresis comparison amplifier A in accompanying drawing 2. accompanying drawings 1 ₁Output characteristic.

Describe technology of the present utility model in detail below in conjunction with accompanying drawing.

See accompanying drawing 1, K _1-1And K _1-2Be DPTT double-pole triple throw working mode selection switch, can select initial charge, floating charge, three kinds of working methods of automatic equalization charging.Work as K _1-1And K _1-2When placing the automatic equalization charging modes, battery overdischarge memory and automatic equalization charging circuit 100 are connected with batteries 300 by fuse RD.Transistor T ₂At emitter output-24V voltage, make operational amplifier A in the emitter following mode ₁Working power, and through three end integrated stable voltage circuits, 7912 generation-12V power supplys, use for this circuit, and be connected to operational amplifier A ₁In-phase input end make reference voltage.

Resistance R ₁R ₂, semifixed resistor RW ₁The voltage divider of forming is given operational amplifier A ₁Inverting input the batteries sampling voltage is provided.A ₁Output by semifixed resistor RW ₂Resistance R ₇To A ₁In-phase input end suitable positive feedback is provided, make A ₁Become the hysteresis comparison amplifier.Its operation principle is referring to accompanying drawing 2(a) and (b) be described as follows: operational amplifier A established ₁The difference of the batteries sampling voltage of the reference voltage of in-phase input end and inverting input is V _i, A ₁Output voltage is V ₀If A ₁Operate in open loop state, then its output characteristic should be as accompanying drawing 2(a) shown in, promptly work as V ₁Negative or just changing shortly past zero the time from negative sense from forward, saltus step takes place by+V in output _Omax→-V _OmaxOr by-V _Omax→+V _OmaxSince the existence of positive feedback, operational amplifier A ₁Output characteristic as accompanying drawing 2(b) shown in.Work as V _iBy negative (A point) to just being changed to V _i=0, V ₀Be-V _OmaxAnd keep this value until Vi=+V _Iy(C point), output voltage generation saltus step is by-V _Omax→+V _Omax(D point), after this V _iContinuation changes to positive direction, V ₀Keep+V _OmaxConstant (E point).Work as V _iBy just (E point) when negative the variation, output V ₀Not only do not do the negative sense saltus step, and work as V at the D point _i=0 until V _i=-V _IyBefore, output all remains+V _OmaxWork as V _i=-V _IyThe time (F point), negative sense saltus step (B point) takes place in output, by+V _Omax→-V _OmaxAfter this V _iContinuation changes (A point), V to negative direction ₀Keep-V _OmaxConstant.This have the voltage comparison amplifier that is similar to the magnetic hysteresis loop characteristic and be called the hysteresis comparison amplifier.The utility model adopts this comparison amplifier with hysteresis characteristic to realize that battery overdischarge is remembered and automatic equalization is charged, the regularly equalizing charge conversion etc. of delaying time.

When Alternating Current Power Supply interrupts, batteries 300 is separately to the power consumption equipment power supply, batteries 300 be discharged to a certain predetermined value (present embodiment is decided to be-45.6V), be overdischarge.At this moment the difference of the batteries sampling voltage of the reference voltage of operational amplifier in-phase input end and inverting input will be in as accompanying drawing 2(b) in-V _IyPoint is with a left side, and output voltage is-V _Omax(in the present embodiment be-24V), light-emitting diode D ₄Through resistance R ₈, diode D ₂Conducting, indication and memory overdischarge take place.

After Alternating Current Power Supply recovered, rectifier 200 recovered direct current output U ₀Because K switch _1-2Also place automatic equalization charging operating state, rectification output U ₀By by semifixed resistor R ₁₅, resistance R ₁₆, resistance R ₅₀, resistance R ₅₂The voltage divider of forming provides the sampling voltage of rectifier output voltage to the voltage stabilizing current-limiting circuit of rectifier 200 inside and since than when the floating charge working method by resistance R ₁₅, R ₁₆, R ₅₂The resitstance voltage divider of forming has increased automatic equalization charging increment sample resistance R ₅₀, so the sampling voltage of this sampling voltage during greater than the floating charge working method.By the automatic levelling of the voltage stabilizing current-limiting circuit in the rectifier 200, make rectification output U ₀U during than the floating charge working method ₀Greatly, this increment is 3.6V in the present embodiment.Promptly realize after overdischarge takes place, will the automatic equalization of charge in batteries being charged with the voltage higher than the float charge voltage of adjusting.

Along with the carrying out of equalizing charge, batteries 300 terminal voltages raise, operational amplifier A ₁The storage battery sampling voltage of inverting input also increase V _iJust changing by negative sense and to reach a certain predetermined value+V _IyThe time (present embodiment batteries terminal voltage is-54V), and A ₁Positive transition, V take place in output ₀=+V _Omax(present embodiment is OV), overdischarge indication (D ₄) extinguish, this positive transition is through diode D ₃Input to integrated timer 4541, pick up counting.Timing can be by timing initialize switch K ₄8 select shelves artificial selection in 1-8 hour scope, the time-delay that this timing is the equalizing charge after the batteries overdischarge is the charging interval regularly.After regularly finishing, timer 4541 output high level pass through resistance R ₁₄Make transistor T ₁Conducting drives the relay J that is serially connected in the emitter circuit ₁Action.Its back contact J _1-1Relieving makes light-emitting diode D ₈Extinguish because of losing power supply, end is regularly all filled in expression.Its normally opened contact J _1-2With short circuit equalizing charge increment sample resistance R ₅₀, be equivalent to change the floating charge operating state automatically over to, choose the floating charge operating state and needn't manually switch be returned.Above-mentioned by resistance R ₁₅, R ₁₆, R ₅₂The voltage divider of forming makes rectifier output U ₀The sampling voltage of sampling voltage when being lower than the equalizing charge working method, by the automatic adjustment of the voltage stabilizing current-limiting circuit in the rectifier 200, make rectification output U ₀Recover setting value, remain floating charge with batteries.Above-mentioned state remains to another overdischarge always A takes place ₁The negative saltus step of output is to timer 4541 zero clearings, relay J ₁Recover inactive state, repeat aforementioned process again.

Work as K _1-1And K _1-2Place when just filling the working method position, the rectifier output voltage sampling value that offers rectifier voltage stabilizing current-limiting circuit will be by semifixed resistor R ₁₇, resistance R ₁₈, resistance R ₅₂Forming voltage divider provides, because R ₁₇The change in resistance scope bigger, can provide higher reference voltage, so the output voltage U of rectifier ₀Excursion also bigger, can reach 36～65V in the present embodiment, can satisfy the requirement of carrying out initial charge by the batteries of 24 joint lead accumulators serial connections fully.And the overdischarge memory of this moment and automatic equalization charging circuit 100 break away from batteries 300, relay J ₁State do not influence the work of initial charge mode.

The utility model when implementing, A ₁Inverting input also be connected with by K switch ₂, resistance R ₃, capacitor C ₁, the force an equalizing charge circuit formed.When for a long time the civil power interruption not taking place, be maintenance storage battery, manually touch switch K ₂, the storage battery sampling voltage is because of resistance R ₁R ₂Semifixed resistor RW ₁With resistance R ₃Instantaneous parallel connection and descending, simulation overdischarge, A ₁The negative saltus step of output forces the equalizing charge and the regularly equalizing charge of time-delay that enter certain hour.

K switch ₃Effect be to stop regularly, promptly at overdischarge indication (D ₄) extinguish, and regularly (D is indicated in equalizing charge ₈) also the end extinguish fixed response time the time equalizing charge operating state in, wish to stop charging and change the floating charge working method over to, as long as the artificial K that touches ₃Can realize.

The utility model also can be at hysteresis comparison amplifier A when implementing ₁Output connect a reversible timer conter, utilize negative sense, the positive transition of the charging of overdischarge generation and automatic equalization, start the positive and negative counting of reversible timer conter, then can be according to overdischarge degree of depth automatic setting delay time regularly, and artificial configuration switch K ₄

The utility model has the advantages that: circuit is simple, with low cost, only utilizes an operational amplifier with positive feedback to make the hysteresis comparison amplifier, can realize overdischarge memory and automatically balanced charging, the automatic conversion of the balanced charging of delay timing.

Claims (3)

1, it is a kind of that to be used for by rectifier be the overdischarge memory and the automatic equalization charging equipment of battery charging from ac mains, comprise the resitstance voltage divider that produces batteries terminal voltage sampling voltage, with three terminal integrated voltage stabilizer, voltage stabilizing didoe is a core generating apparatus internal circuit working power, the stabilized voltage power supply of reference voltage, the timer and the switch that presets delay time of the equalizing charge of control automatic time delay, resistance is selected circuit, regularly finish to drive the transistor circuit of the actuating of relay, select initial charge, floating charge, automatic equalization charging work State Selection switch, it is characterized in that: also comprise and adopt output to in-phase input end to have the operational amplifier of positive feedback resistor to make the hysteresis comparison amplifier, its in-phase input end connects the batteries sampling voltage, inverting input connects reference voltage, civil power interrupts batteries and is overdisharged to predetermined value, the negative saltus step of hysteresis comparison amplifier output, the memory overdischarge, the city power recovery, rectifier to the storage battery equalizing charge to another particular value, hysteresis comparison amplifier output positive transition, the charging of driving timing delay balance.

2, according to claim 1 is the overdischarge memory and the automatic equalization charging equipment of battery charging from ac mains by rectifier, it is characterized in that described initial charge, floating charge, automatic equalization charging work State Selection switch connect three groups of resitstance voltage dividers respectively, the sampling voltage value of the rectifier output voltage under corresponding three kinds of operating states, wherein the resitstance voltage divider of automatic equalization charged state increases automatic equalization charging increment sample resistance than floating charge operating state.

3, according to claim 1 and 2 is the overdischarge memory and the automatic equalization charging equipment of battery charging from ac mains by rectifier, the transistor circuit that it is characterized in that the described driving actuating of relay, the normally opened contact of relay is in parallel with automatic equalization charging increment sample resistance.

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